The vertical bar represents an alternative and the terminal symbols are enclosed with quotation marks followed by a semicolon as terminating character.
12.
A terminal symbol, such as a word or a token, is a stand-alone structure in a language being defined.
13.
In a tree representation of a grammar, a terminal symbol of a production rule corresponds to a leaf node of the tree.
14.
The grammar's terminal symbols are the multi-character symbols or'tokens'found in the input stream by a lexical scanner.
15.
One can read off the corresponding terminal string by performing an ordered tree traversal and recording the terminal symbols in the order they are encountered.
16.
By this definition, it is always possible to add terminal symbols to the end of a viable prefix to obtain a right sentential form.
17.
Such a grammar defines the formal language : all words consisting solely of terminal symbols which can be reached by a derivation from the start symbol.
18.
Its parent nodes corresponds to a non-terminal symbol ( e . g . a noun phrase or a verb phrase ) in the rule set.
19.
The SLR generator works out Follow ( S ), the set of all terminal symbols which can immediately follow some occurrence of " S ".
20.
Since such a tree does not exist for all strings, S is padded with a terminal symbol not seen in the string ( usually denoted $ ).
